Don't create twenty numbered variables. Although beginners keep doing this, using numbered variables leads to beginners writing slow, obfuscated, buggy programs. Here is why:
Note how the very first thing that Walter Roberson does in their comment (below) is to put all of these variables into one cell array, because this makes any processing of these variables much much easier. You should do the same: keep them in one variable, not twenty numbered ones.
The optimal storage would be in one numeric matrix.
